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Stockholders' Equity - Required Capital Amounts and Company's Respective Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Parent Company [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 728,635 | $ 669,213
Total Capital To Risk Weighted Assets Actual Ratio | 15.33% | 14.47%
Capital Required For Capital Adequacy Amount | $ 380,351 | $ 370,094
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 410,066 |
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 8.625% | 8.625%
Common Equity Tier 1 Risk Based Capital Amount | $ 648,942 | $ 596,547
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 13.65% | 12.90%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 213,947 | $ 208,178
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 243,662 |
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.125% | 5.125%
Tier 1 Risk Based Capital Amount | $ 679,942 | $ 627,547
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 14.30% | 13.57%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 285,263 | $ 277,570
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 314,978 |
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.625% | 6.625%
Tier 1 Capital Amount | $ 679,942 | $ 627,547
Tier 1 Capital To Average Assets Ratio | 9.94% | 9.49%
Tier 1 Capital Required For Capital Adequacy Amount | $ 273,510 | $ 264,333
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
BancFirst [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital Amount | $ 655,620 | $ 607,604
Total Capital To Risk Weighted Assets Actual Ratio | 13.80% | 13.15%
Capital Required For Capital Adequacy Amount | $ 379,948 | $ 369,607
Capital Required For Capital Adequacy to Risk Weighted Assets Ratio | 8.00% | 8.00%
Capital With Capital Conservation Buffer Amount | $ 409,631 |
Capital With Capital Conservation To Risk Based Weighted Assets Buffer Ratio | 8.625% | 8.625%
Capital Required To Be Well Capitalized Amount | $ 474,934 | $ 462,009
Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 10.00% | 10.00%
Common Equity Tier 1 Risk Based Capital Amount | $ 586,927 | $ 545,938
Common Equity Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.36% | 11.82%
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 213,720 | $ 207,904
Common Equity Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 4.50% | 4.50%
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 243,404 |
Common Equity Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 5.125% | 5.125%
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 308,707 | $ 300,306
Common Equity Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 6.50% | 6.50%
Tier 1 Risk Based Capital Amount | $ 606,927 | $ 565,938
Tier 1 Risk Based Capital To Risk Weighted Assets Ratio | 12.78% | 12.25%
Tier 1 Risk Based Capital Required For Capital Adequacy Amount | $ 284,961 | $ 277,205
Tier 1 Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets Ratio | 6.00% | 6.00%
Tier 1 Risk Based Capital With Capital Conservation Buffer Amount | $ 314,644 |
Tier 1 Risk Based Capital With Capital Conservation Buffer To Risk Weighted Assets Ratio | 6.625% | 6.625%
Tier 1 Risk Based Capital Required To Be Well Capitalized Amount | $ 379,948 | $ 369,607
Tier 1 Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets Ratio | 8.00% | 8.00%
Tier 1 Capital Amount | $ 606,927 | $ 565,938
Tier 1 Capital To Average Assets Ratio | 8.89% | 8.59%
Tier 1 Capital Required For Capital Adequacy Amount | $ 273,152 | $ 263,606
Tier 1 Capital Required For Capital Adequacy To Average Assets Ratio | 4.00% | 4.00%
Tier 1 Capital Required To Be Well Capitalized Amount | $ 341,440 | $ 329,507
Tier 1 Capital Required To Be Well Capitalized To Average Assets Ratio | 5.00% | 5.00%

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